Impedance bond is used on electrified tracks to separate return line of traction current from the power for rail current of track circuit. Impedance bond has double function: it enables galvanic continuity through isolated structure for return traction current and disables current flow from one section to the next section. According to the way of use, it can be power or relay bond. On the power side, an impedance bond transforms the power from the power transformer to voltage needed for powering of track circuit. On the relay side, at the end of the section, it transforms track power to the value needed for attracting control relay. It is placed into concrete housing next to the rails, directly by isolated rail structure.